/*
 * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
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 *
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 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.imageio.plugins.gif;

import java.util.Arrays;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;

public class GIFStreamMetadataFormat extends IIOMetadataFormatImpl {

    private static IIOMetadataFormat instance = null;

    private GIFStreamMetadataFormat() {
        super(GIFStreamMetadata.nativeMetadataFormatName, CHILD_POLICY_SOME);

        // root -> Version
        addElement("Version", GIFStreamMetadata.nativeMetadataFormatName, CHILD_POLICY_EMPTY);
        addAttribute("Version", "value", DATATYPE_STRING, true, null, Arrays.asList(GIFStreamMetadata.versionStrings));

        // root -> LogicalScreenDescriptor
        addElement("LogicalScreenDescriptor", GIFStreamMetadata.nativeMetadataFormatName, CHILD_POLICY_EMPTY);
        addAttribute("LogicalScreenDescriptor", "logicalScreenWidth", DATATYPE_INTEGER, true, null, "1", "65535", true, true);
        addAttribute("LogicalScreenDescriptor", "logicalScreenHeight", DATATYPE_INTEGER, true, null, "1", "65535", true, true);
        addAttribute("LogicalScreenDescriptor", "colorResolution", DATATYPE_INTEGER, true, null, "1", "8", true, true);
        addAttribute("LogicalScreenDescriptor", "pixelAspectRatio", DATATYPE_INTEGER, true, null, "0", "255", true, true);

        // root -> GlobalColorTable
        addElement("GlobalColorTable", GIFStreamMetadata.nativeMetadataFormatName, 2, 256);
        addAttribute("GlobalColorTable", "sizeOfGlobalColorTable", DATATYPE_INTEGER, true, null, Arrays.asList(GIFStreamMetadata.colorTableSizes));
        addAttribute("GlobalColorTable", "backgroundColorIndex", DATATYPE_INTEGER, true, null, "0", "255", true, true);
        addBooleanAttribute("GlobalColorTable", "sortFlag", false, false);

        // root -> GlobalColorTable -> ColorTableEntry
        addElement("ColorTableEntry", "GlobalColorTable", CHILD_POLICY_EMPTY);
        addAttribute("ColorTableEntry", "index", DATATYPE_INTEGER, true, null, "0", "255", true, true);
        addAttribute("ColorTableEntry", "red", DATATYPE_INTEGER, true, null, "0", "255", true, true);
        addAttribute("ColorTableEntry", "green", DATATYPE_INTEGER, true, null, "0", "255", true, true);
        addAttribute("ColorTableEntry", "blue", DATATYPE_INTEGER, true, null, "0", "255", true, true);
    }

    public boolean canNodeAppear(String elementName, ImageTypeSpecifier imageType) {
        return true;
    }

    public static synchronized IIOMetadataFormat getInstance() {
        if (instance == null) {
            instance = new GIFStreamMetadataFormat();
        }
        return instance;
    }
}
